Depression, immune function, and early adrenarche in children.

Area of Science:

• Child Psychology
• Immunology
• Endocrinology

Background:

• The relationship between depression and immunity is established in adults and adolescents, but less understood in children.
• Previous studies in children have shown mixed results, indicating potential confounding factors or moderators.
• Adrenarche, the initial pubertal phase in late childhood, is associated with both immune function and psychological well-being, making it a potential moderator.

Purpose of the Study:

• To investigate the association between depression and immune markers in children.
• To determine if adrenarcheal timing moderates the depression-immunity relationship.
• To examine if gender moderates this association.

Main Methods:

• A nested study of 103 children (ages 8.67-10.21) from a population-based cohort.
• Assessed depression using the Children's Depression Inventory 2 (CDI-2).
• Measured immune markers (C-reactive protein, CRP; secretory immunoglobulin A, SIgA) via morning saliva samples.

Main Results:

• Inflammation (CRP) positively correlated with negative mood/physical symptoms (NM/PS) subscale of the CDI-2.
• A significant interaction between SIgA and adrenarcheal timing was found for NM/PS and Interpersonal Problems.
• The association between SIgA and depression symptoms varied based on adrenarcheal timing, with different patterns for early versus late developers.

Conclusions:

• Adrenarcheal timing significantly influences the association between depression and immunity in children.
• Hormonal changes during earlier adrenarche may partially explain observed depression-immunity associations.
• Adrenarcheal timing is a crucial consideration for future research on pediatric depression and immune function.